Truncating an Object (SDK for Java)
Function
This API truncates an object in the PFS.
If you have any questions during development, post them on the Issues page of GitHub.
Restrictions
- To truncate an object, you must be the PFS owner or have the required permission (obs:bucket:PutObject in IAM or PutObject in a policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Configuring an Object Policy.
- The mapping between OBS regions and endpoints must comply with what is listed in Regions and Endpoints.
- This API is currently available only for PFSs. For details about how to create a PFS, see Creating a Parallel File System (SDK for Java).
Method
obsClient.truncateObject(TruncateObjectRequest request)
Request Parameters
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
request |
Yes |
Explanation: Request parameters for truncating an object. For details, see Table 2. |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
bucketName |
String |
Yes |
Explanation: Bucket name. Restrictions:
Default value: None |
objectKey |
String |
Yes |
Explanation: Name of a file object. An object is uniquely identified by an object name in a bucket. An object name is a complete path that does not contain the bucket name. For example, if the address for accessing the object is examplebucket.obs.ap-southeast-1.myhuaweicloud.com/folder/test.txt, the object name is folder/test.txt. Value range: The value must contain 1 to 1,024 characters. Default value: None |
newLength |
long |
Yes |
Explanation: Size of the file after being truncated. Default value: None |
Responses
Parameter |
Type |
Description |
---|---|---|
statusCode |
int |
Explanation: HTTP status code. Value range: A status code is a group of digits that can be 2xx (indicating successes) or 4xx or 5xx (indicating errors). It indicates the status of a response. For more information, see Status Code. Default value: None |
responseHeaders |
Map<String, Object> |
Explanation: Response header list, composed of tuples. In a tuple, the String key indicates the name of the header, and the Object value indicates the value of the header. Default value: None |
Code Examples
This example truncates object objectname in parallel file system examplebucket to 1024L.
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import com.obs.services.ObsClient; import com.obs.services.exception.ObsException; import com.obs.services.model.TruncateObjectRequest; import com.obs.services.model.TruncateObjectResult; public class TruncateObject001 { public static void main(String[] args) { // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage. // Obtain an AK/SK pair on the management console. String ak = System.getenv("ACCESS_KEY_ID"); String sk = System.getenv("SECRET_ACCESS_KEY_ID"); // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage. // Obtain an AK/SK pair and a security token using environment variables or import them in other ways. // String securityToken = System.getenv("SECURITY_TOKEN"); // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation. String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com"; // Obtain an endpoint using environment variables or import it in other ways. //String endPoint = System.getenv("ENDPOINT"); // Create an ObsClient instance. // Use the permanent AK/SK pair to initialize the client. ObsClient obsClient = new ObsClient(ak, sk,endPoint); // Use the temporary AK/SK pair and security token to initialize the client. // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint); try { // Truncate an object. TruncateObjectRequest request = new TruncateObjectRequest(); request.setBucketName("examplebucket"); request.setObjectKey("objectname"); request.setNewLength(1024L); TruncateObjectResult result = obsClient.truncateObject(request); System.out.println("truncateObject successfully"); System.out.println("HTTP Code: " + result.getStatusCode()); } catch (ObsException e) { System.out.println("truncateObject failed"); // Request failed. Print the HTTP status code. System.out.println("HTTP Code:" + e.getResponseCode()); // Request failed. Print the server-side error code. System.out.println("Error Code:" + e.getErrorCode()); // Request failed. Print the error details. System.out.println("Error Message:" + e.getErrorMessage()); // Request failed. Print the request ID. System.out.println("Request ID:" + e.getErrorRequestId()); System.out.println("Host ID:" + e.getErrorHostId()); e.printStackTrace(); } catch (Exception e) { System.out.println("truncateObject failed"); // Print other error information. e.printStackTrace(); } } } |
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